C. F. Keil and Franz Delitzsch on 1 Chronicles 5:11

1Ch 5:11 The families of the tribe of Gad, and their dwelling-places. - 1Ch 5:11. In connection with the preceding statement as to the dwelling-places of the Reubenites, the enumeration of the families of Gad begins with a statement as to their dwelling-places: “Over against them (the Reubenites) dwelt the Gadites in Bashan unto Salcah.” Bashan is used here in its wider signification of the dominion of King Og, which embraced the northern half of Gilead, i.e., the part of that district which lay on the north side of the Jabbok, and the whole district of Bashan; cf. on Deu 3:10. Salcah formed the boundary towards the east, and is now Szalchad, about six hours eastward from Bosra (see on Deu 3:10).